Abstract
Photochemical hole burning (PHB) is a topic of attracting increasing interest from spectroscopic viewpoints as well as from the practical prospects for ultra-high-density frequency-domain optical storage. Recent advances in PHB study are reviewed mainly focusing on the effects of chemical structure of guest ions and molecules as well as host matrices on the efficiency of hole formation and its temperature dependence, low energy excitation modes and Debye-Waller factors in amorphous matrices, and the mechanism of photon-gated PHB.
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